body {
    font-family: sans-serif;
}

.container {
    display: flex;
    width: 90%;
    margin: 20px auto;
}

.sidebar {
    width: 20%;
    background-color: #f0f0f0;
    padding: 10px;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    margin-left: 70px; /* 向右移动一点 */
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    margin-bottom: 5px;
}

.sidebar .nav-link {
    text-decoration: none;
    color: #336633; /* Dark Green */
    display: block;
    padding: 10px;
    transition: background-color 0.3s ease;
}

.sidebar .nav-link:hover {
    background-color: #e0f2d4; /* Lighter Green */
}

.content {
    flex: 1;
    padding: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
}

.content-section{
    display: block; /*Initially show the first section*/
}

header nav {
    background-color: #333;
    color: white;
    padding: 10px;
    text-align: center;
}

.text-green {
    color: #336633; /* Dark Green */
}